Allow core uids to register receiver as "android".

System components can run in any processes belonging to core uids. If
one of such components end up registering a receiver, it will get
registered as "android".

Bug: 387930030
Test: builds
Flag: EXEMPT bugfix
Merged-In: Ied09800f02e03a52efe39f959265da7cb1e1ddc0
Merged-In: I3fc4c9097602147e44ef77ad80defd33d8f5a2fc
Change-Id: Ia577940331af5a79804aa6afcd1773e207a58558